Migrate gh, emacs to sysexts; remove from Containerfile

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: shanemcd

docs/SYSEXTS.md

@@ -13,6 +13,8 @@ We're on a journey to remove as much as possible from our bootc container image
 | libvirt + qemu | `libvirtd-desktop` | fedora | ~500+ MB | Available (F43 not on extensions.fcos.fr yet, use [GitHub releases](https://github.com/fedora-sysexts/fedora/releases/tag/libvirtd-desktop)) |
 | `docker-ce` | `docker-ce` | community | ~98 MB | Available |
 | `tailscale` | `tailscale` | community | ~65 MB | Available |
+| `gh` | `gh` | fedora | ~55 MB | Available |
+| `emacs` | `emacs` | fedora | ~289 MB | Available |
 
 ### Removed from image (no sysext)
 
@@ -32,9 +34,7 @@ These packages have sysext equivalents and could be removed from the Containerfi
 
 | Package | Sysext | Repo | Size | Notes |
 |---------|--------|------|------|-------|
-| `emacs` | `emacs` | fedora | ~289 MB | |
 | `chromium` | `chromium` | fedora | ~335 MB | |
-| `gh` | `gh` | fedora | ~55 MB | |
 | `ripgrep` | `ripgrep` | fedora | small | |
 | `zsh` | `zsh` | fedora | small | |
 | `tmux` | `tmux` | fedora | small | |

mybox/Containerfile

@@ -20,9 +20,6 @@ RUN <<EORUN
         https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-$VERSION_ID.noarch.rpm \
         https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$VERSION_ID.noarch.rpm
 
-    # Third-party repositories
-    dnf config-manager addrepo --from-repofile=https://cli.github.com/packages/rpm/gh-cli.repo
-
     # 1Password CLI repository
     curl -fsSL https://downloads.1password.com/linux/keys/1password.asc -o /etc/pki/rpm-gpg/RPM-GPG-KEY-1password
     rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-1password
@@ -65,9 +62,7 @@ RUN <<EORUN
         \
         `# Development tools` \
         cmake \
-        emacs \
         fzf \
-        gh \
         go-task \
         libtool \
         python-devel \